Marks on the PCB

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Askic
    Senior Member
    • Sep 2018
    • 187
    • BIH
    #1

    Marks on the PCB

    Hello guys,
    what would you say if you see marks on the PCB like the one shown in attached pictures?
    Are those traces from liquid or something else?

    Thank you!
    Attached Files
    Tags: None
    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: Marks on the PCB

      Crusty looking capacitors, green vias, looks like liquid to me.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 31051
          • Albion
          #3
          Re: Marks on the PCB

          the green vias are solder-mask to protect the conductive paint.

          the white could be a sign of moisture or just poor factory de-fluxing.

            Comment

            • Askic
              Senior Member
              • Sep 2018
              • 187
              • BIH
              #4
              Re: Marks on the PCB

              Originally posted by stj
              the green vias are solder-mask to protect the conductive paint.

              the white could be a sign of moisture or just poor factory de-fluxing.
              This board was in spare parts stock for about 10 years. It wasn't properly sealed but never used. I'm gonna use toothbrush and some isopropyl alcohol to clean it.

                Comment

                Previous template Next

                Related Topics

                Collapse
                • Hondaman
                  Liquid cooling?
                  by Hondaman
                  I hope my computer does not randomly reboot while typing this. My main system is the AsRock 970A-G/3.1 motherboard with the AMD 8150 chip. I am experiencing FREQUENT and RANDOM reboots once the system is used for a couple of hours (sometimes it reboots before I even get to the Win7/Linux Mint dual-boot screen). The problem MIGHT be the DRAM controller chip (I recently upgraded to the maximum 64 GB RAM). It also might be the VRM chips. I am using a typical aftermarket CPU cooler, which does NOT blow air DOWN onto the VRM heat sink.

                  (After previous generation hardware [Gigabyte] didn't...
                  05-08-2025, 09:37 PM
                • kurland
                  Strange liquid on damaged GTX1080 card
                  by kurland
                  Hi,

                  I'm fixing a GPU card for a streamer, was sent to me by mail. A shorted cap on a power rail has severely burned the PCB.



                  As you can see from the darkened PCB around the mosfets there are signs of liquid damage. But it's odd because the person says no water has entered the PC cabinet. If you spill something on a desktop you would know I guess...

                  Funny thing is that the liquid is not only on the PCB but on top of many chips which are tightly covered by thermal padding under the heatsink, even on top of some of the RAM chips

                  ...
                  11-17-2020, 07:14 PM
                • mitchw
                  MacBook Pro 16 M1 Pro Liquid Damage (820-02100)
                  by mitchw
                  Got a MacBook Pro M1 Pro 16'' to rescue immediately after liquid accident - I got it in less than 30 minutes after the spill.
                  It got spilled from behind when the laptop was closed. It mostly affected the rear of the mainboard and the bottom of the LCD.

                  I quickly took it apart and washed the liquid residue off the mainboard.
                  The area around the UP800 had some light corrosion, but it just washed away with some IPA. Other areas looked undamaged.

                  The mainboard got a thorough cleaning, as did the top case and LCD connectors / cables.

                  Now the laptop...
                  07-16-2025, 07:55 AM
                • Jane
                  What liquid to use
                  by Jane
                  I would like to repair faulty backlight in Philips TV. In various videos, guys use a liquid before using a suction tool.
                  Can anyone let me know what kind of the liquid is it? Or what liquid do you use?
                  Thank you
                  Here is a video
                  https://www.youtube.com/watch?v=XzFT-o64jDQ
                  02-15-2024, 05:51 AM
                • bloodhound
                  Acer C27-1655 no power after liquid damage
                  by bloodhound
                  Hi!

                  I´ve got an Acer C27-1655 AiO computer for repair on my bench.
                  Mainboard: AX1T_MAIN_PCB

                  The liquid was mainly in the area of MQ1, the voltage regulator for +VDDQ_MEM (pictures attached).

                  Symptoms:
                  When power is connected and power switch is pressed, I get 5V at L1, 3.3V at L2 and 1.8V at LPM5. I also get V1.05A_BYPASS at R442 for PCH.
                  I also measure 2V on +V1.8U_2.5U_MEM but +VDDQ_VTT and +VDDQ_MEM stay at 0V. +V1.8U_2.5U_MEM is also drawn to 0V if RAM memory is installed.
                  LPM1, LPM2 and LPM3 stay at 0V.

                  +VDDQ_MEM...
                  11-19-2024, 05:23 AM
                • Loading...
                • No more items.
                Working...